It looks like it could be lichen off of a shaded branch. If it’s from California it’s almost certainly not spotted lantern fly. I am in Westmoreland County Pennsylvania and the lantern flies are almost certainly in my county this year. A friend found them in White Oak Park which is on the border with Allegheny County. This makes me very sad. Anyway, As stated above You should try to treat it to be safe. You could also try the bleach solution soak posted on this thread Good system for preparing winter dormancy graft cuttings
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